Question

What do the president and other people of us swear on the stack of timetables

Answer 1

THE presidents of the New York Central and the New York, New Haven and Hartford railroads will swear on a stack of timetables that there are only two.

Now I know the meaning of the well established idiom "to swear on a stack of bibles". But I want to ask if the author using "timetables" instead of "bibles" is an example of a slight variation

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